Harpie and Amazone cards (mainly Harpie)
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40 cards
The maximum is 60 in the main deck.
In Yu-Gi-Oh, a sideboard is called a side deck where you put extra cards in to switch out in between duels. However, a side deck must contain 15 cards or 0 cards.
15 15
Well, the minimum in a yugioh deck is 40 cards maximum 80cards. Most people try to have a smaller deck over a larger deck, to get cards they need. About a 40-50 card deck is good.